EGU22-8255, updated on 28 Mar 2022
EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Status and prospects for the neXtSIM-F CMEMS operational forecast

Timothy Williams, Anton Korosov, Einar Olason, and Laurent Bertino
Timothy Williams et al.
  • Nansen Environmental and Remote Sensing Center, Bergen, Norway (

The neXtSIM-F operational forecast was upgraded in December 2021, with the following developments:

  • improvements to the rheology, with the neXtSIM model now running the latest version of the Brittle Bingham-Maxwell rheology (BBM).
      The previous version  was running a preliminary version of the BBM rheology.
  • The model domain was extended to include the Labrador Sea, Hudson and Baffin Bay.
  • Better tuning of dynamic (eg of basal stress parameters for the fast ice off the coast of the eastern Arctic)  and thermodynamic parameters.

The upgrade resulted in good improvements to the ice thickness and extent, although drift developed a slight slow bias. However the bias is of the order
of the observation error (1-1.25km/day).

Planned developments for the next 3 years include:

  • assimilation of ice thickness data
  • assimilation of ice extent from NIC ice charts (National Ice Center, USA)  instead of from passive microwave (OSISAF).
  • increased resolution, to go from about 7.5km to about 3.75km
  • a multi-year reanalysis to be updated every month

How to cite: Williams, T., Korosov, A., Olason, E., and Bertino, L.: Status and prospects for the neXtSIM-F CMEMS operational forecast, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-8255,, 2022.


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